Flyback-Based Three-Port Topologies for Electrolytic Capacitor-Less LED Drivers
Abstract
Electrolytic capacitors are the components that mainly impact the lifetime of AC/DC light-emitting diode (LED) drivers. Therefore, eliminating electrolytic capacitors from LED drivers is of vital importance. Firstly, the basic derivation concept of a family of Flyback-based three-port converters (TPC) for electrolytic capacitor-less LED drivers is addressed in this paper, by manipulating the power flow a input port, output port, and storage capacitors. Together with the derivation of existing topologies, new topologies are also proposed. After evaluation, an integrated dual Flyback converter (IDFC) is chosen, which requires less switching components and simpler control strategy. Following that, the operation principle and switching modes of the IDFC are elaborated, as well as the parameter design and implementation of control strategy. Finally, experiments on a laboratory prototype are carried out to verify the feasibility of the proposed topology.
EXISTING SYSTEM:
The core idea of eliminating electrolytic capacitors through control strategy improvement is to reduce the pulsating power ΔE, where the required capacitance will consequently be reduced. Certain amount of harmonics is injected into the input current to lower the ripple magnitude of input power and to decrease the peak-to-average power ratio (PAPR) in, as shown in. But smaller capacitance requires higher injected harmonic current magnitude, resulting in lower PF . Another solution of allowing LED to endure reasonable pulsating current is brought up in , to make the output power pulsate at the same frequency with the input power, in which case the pulsating power that the capacitor needs to deal with will be reduced, like Fig. 1 (b). Low-frequency current driving will sabotage the input PF and the general performances of LED however. A method offered in is capable of manipulating the output power by splitting the load into several modules and conducting phase shifted operation of modules, depicted in which is deeply dependent on the number of modules the LED load can be split to and is better suitable for high-power applications.
PROPOSED SYSTEM:
If the pulsating power ΔE remains unchanged, the average voltage or ripple magnitude on storage capacitor can be increased by restructuring the topology, and the capacitance needed is reduced in turn. A proposal of power decoupling through paralleling a bi-directional converter between PFC converter and LED load to balance ΔE is put forward. DC/DC converter is used to compensate the output voltage ripple in PFC converter, weakening its influences on LED,. Nevertheless, topologies mentioned are loosely integrated and add to the difficulty in control strategy.
CONCLUSION
The problem of eliminating electrolytic capacitor is one of the barriers blocking the development of LED lighting drivers. The paper demonstrates the deduction principle of TPC topologies and proposes a series of topologies of electrolytic capacitor-less TPC LED driver based on the Flyback converter. An integrated dual Flyback converter (IDFC) is selected for further investigation, which requires less switching components and simpler control strategy. The operation principle and switching modes of the proposed IDFC are elaborated, as well as the parameter design. Although experiments have proved the feasibility of the proposed topology, it needs to be further explored for better performance.
REFERENCES
[1] R. Haitz, “Another semiconductor revolution: this time it’s lighting,” in Proc. Advances in solid state physics, 2003, pp. 35–50.
[2] R. Haitz, and J. Y. Tsao, “Solid-state lighting:‘The case’10 years after and future prospects,” physica status solidi, vol. 208, no. 1, pp. 17– 29, Jan.2011.
[3] A. Lay-Ekuakille, F. Aniello, F. Miduri, D. Leonardi, and A. Trotta, “Smart control of road-based LED fixtures for energy saving,” in Proc. IEEE Intell. Data Acquisition Adv. Comput. Syst., 2009, pp. 59–62.
[4] X. Tao, and S. R. Hui, “Dynamic photoelectrothermal theory for light-emitting diode systems,” IEEE Trans. on Ind. Electron., vol. 59, no. 4, pp. 1751–1759, Apr.2012.
[5] S. Hui, and Y. Qin, “A general photo-electro-thermal theory for light emitting diode (LED) systems,” IEEE Trans. on Power Electron., vol. 24, no. 8, pp. 1967–1976, Aug.2009.
[6] M. Dyble, N. Narendran, A. Bierman, and T. Klein, “Impact of dimming white LEDs: chromaticity shifts due to different dimming methods,” in Proc. Fifth International Conference on Solid State Lighting., pp. 291– 299, Jul.2005.
[7] ENERGY STAR® Program Requirements Product Specification for Luminaires,Washington, D.C.:U.S. Environmental Protection Agency and U.S. Department of Energy, 2007.
[8] IEC -1000-3-2 Class C. Harmonics standards for commercial electronic products.
[9] Philips. LED Lifetime.2013. [Online]. Available: http://wwww. Colorki netics.com/support/White papers/LED Lifetime. Pdf
[10] L. Han, and N. Narendran, “An accelerated test method for predicting the useful life of an LED driver,” IEEE Trans. on Ind. Electron., vol. 26, no. 8, pp. 2249–2257, Aug.2011.
Flyback-Based Three-Port Topologies for Electrolytic Capacitor-Less LED Drivers
Abstract
Electrolytic capacitors are the components that mainly impact the lifetime of AC/DC light-emitting diode (LED) drivers. Therefore, eliminating electrolytic capacitors from LED drivers is of vital importance. Firstly, the basic derivation concept of a family of Flyback-based three-port converters (TPC) for electrolytic capacitor-less LED drivers is addressed in this paper, by manipulating the power flow a input port, output port, and storage capacitors. Together with the derivation of existing topologies, new topologies are also proposed. After evaluation, an integrated dual Flyback converter (IDFC) is chosen, which requires less switching components and simpler control strategy. Following that, the operation principle and switching modes of the IDFC are elaborated, as well as the parameter design and implementation of control strategy. Finally, experiments on a laboratory prototype are carried out to verify the feasibility of the proposed topology.
EXISTING SYSTEM:
The core idea of eliminating electrolytic capacitors through control strategy improvement is to reduce the pulsating power ΔE, where the required capacitance will consequently be reduced. Certain amount of harmonics is injected into the input current to lower the ripple magnitude of input power and to decrease the peak-to-average power ratio (PAPR) in, as shown in. But smaller capacitance requires higher injected harmonic current magnitude, resulting in lower PF . Another solution of allowing LED to endure reasonable pulsating current is brought up in , to make the output power pulsate at the same frequency with the input power, in which case the pulsating power that the capacitor needs to deal with will be reduced, like Fig. 1 (b). Low-frequency current driving will sabotage the input PF and the general performances of LED however. A method offered in is capable of manipulating the output power by splitting the load into several modules and conducting phase shifted operation of modules, depicted in which is deeply dependent on the number of modules the LED load can be split to and is better suitable for high-power applications.
PROPOSED SYSTEM:
If the pulsating power ΔE remains unchanged, the average voltage or ripple magnitude on storage capacitor can be increased by restructuring the topology, and the capacitance needed is reduced in turn. A proposal of power decoupling through paralleling a bi-directional converter between PFC converter and LED load to balance ΔE is put forward. DC/DC converter is used to compensate the output voltage ripple in PFC converter, weakening its influences on LED,. Nevertheless, topologies mentioned are loosely integrated and add to the difficulty in control strategy.
CONCLUSION
The problem of eliminating electrolytic capacitor is one of the barriers blocking the development of LED lighting drivers. The paper demonstrates the deduction principle of TPC topologies and proposes a series of topologies of electrolytic capacitor-less TPC LED driver based on the Flyback converter. An integrated dual Flyback converter (IDFC) is selected for further investigation, which requires less switching components and simpler control strategy. The operation principle and switching modes of the proposed IDFC are elaborated, as well as the parameter design. Although experiments have proved the feasibility of the proposed topology, it needs to be further explored for better performance.
REFERENCES
[1] R. Haitz, “Another semiconductor revolution: this time it’s lighting,” in Proc. Advances in solid state physics, 2003, pp. 35–50.
[2] R. Haitz, and J. Y. Tsao, “Solid-state lighting:‘The case’10 years after and future prospects,” physica status solidi, vol. 208, no. 1, pp. 17– 29, Jan.2011.
[3] A. Lay-Ekuakille, F. Aniello, F. Miduri, D. Leonardi, and A. Trotta, “Smart control of road-based LED fixtures for energy saving,” in Proc. IEEE Intell. Data Acquisition Adv. Comput. Syst., 2009, pp. 59–62.
[4] X. Tao, and S. R. Hui, “Dynamic photoelectrothermal theory for light-emitting diode systems,” IEEE Trans. on Ind. Electron., vol. 59, no. 4, pp. 1751–1759, Apr.2012.
[5] S. Hui, and Y. Qin, “A general photo-electro-thermal theory for light emitting diode (LED) systems,” IEEE Trans. on Power Electron., vol. 24, no. 8, pp. 1967–1976, Aug.2009.
[6] M. Dyble, N. Narendran, A. Bierman, and T. Klein, “Impact of dimming white LEDs: chromaticity shifts due to different dimming methods,” in Proc. Fifth International Conference on Solid State Lighting., pp. 291– 299, Jul.2005.
[7] ENERGY STAR® Program Requirements Product Specification for Luminaires,Washington, D.C.:U.S. Environmental Protection Agency and U.S. Department of Energy, 2007.
[8] IEC -1000-3-2 Class C. Harmonics standards for commercial electronic products.
[9] Philips. LED Lifetime.2013. [Online]. Available: http://wwww. Colorki netics.com/support/White papers/LED Lifetime. Pdf
[10] L. Han, and N. Narendran, “An accelerated test method for predicting the useful life of an LED driver,” IEEE Trans. on Ind. Electron., vol. 26, no. 8, pp. 2249–2257, Aug.2011.